just knocking about with garage band (from ilife 06)
How do you expoert your track?

I can export to podcast or send to itunes? is that the only ways?

Also when i do export it leave like a few seconds of no sound at the end of the track. How do i get rid of that? i dont see where you can set in and out points.

To get rid of the dead air at the end go to the end of the track in GB and slide the little arrow (at top) to where you want the track to end.

As for exporting, the best way I have found is to send it to itunes. You can then convert it to mp3. If you export as a podcast, it will convert to ACC. Athough a nice format and is the only one that handles "enhanced Podcasts" it can be limiting.